#define  _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
#include<string.h>
int main()
{
	char arr1[] = "123";
	char arr2[10] = { 0 };
	int ret=strcmp (arr1, arr2);
	char arr3[20] = "hello";
	char arr4[] = "world";
	strcat(arr3, arr4);
	//char* strcpy(arr3, arr4);
	printf("%d \n", ret);
	printf("%s\n", arr3);
	return 0;
}